Wildlife Trade Significantly Increases Pandemic Risk, Modern Study Finds
The global wildlife trade isn’t just moving animals across borders; it’s moving dangerous pathogens. A groundbreaking study published in Science reveals that animals traded in global markets are far more likely to carry diseases that can jump to humans than those not involved in trade. This discovery provides some of the strongest evidence to date that curbing the wildlife trade is essential for reducing the risk of future pandemics.
The Data: Traded vs. Non-Traded Species
Researchers, including ecologist Jérôme Gippet from the University of Fribourg and epidemiologist Colin Carlson from the Yale School of Public Health, analyzed 40 years of international trade records and thousands of wild mammal species. The results are stark: 41% of traded mammal species share at least one pathogen with humans, although only 6.4% of non-traded species do (LA Times).
The study focused on mammals given that they’re heavily represented in the trade—roughly one-quarter of all mammal species are traded—and they have a long history of transmitting pathogens to people (Nature).
How Trade Amplifies Disease Risk
One of the most alarming findings is that the wildlife trade doesn’t just expose humans to existing risks; it actively amplifies them over time. The research indicates that species acquire, on average, one additional human-infecting pathogen for every decade they remain in global wildlife markets (LA Times).
This suggests that the longer a species is circulated within these markets, the higher the risk of disease spillover becomes. This “amplification” effect turns global markets into breeding grounds for potential outbreaks.
Linking Trade to Major Outbreaks
While this study provides the first global quantitative evidence of the link between trade and pathogen sharing, scientists have long suspected this connection. Many of the world’s most devastating disease outbreaks have already been linked to traded wildlife, including:
- HIV
- Ebola (specifically the 2014 West African epidemic)
- COVID-19
Key Takeaways
- High Risk: Over 40% of traded mammal species carry pathogens that can infect humans.
- Cumulative Danger: The risk grows over time, with species gaining one new human-infecting pathogen every decade in trade.
- Broad Impact: The wildlife trade affects a quarter of all terrestrial vertebrates (Science).
- Prevention: Reducing the wildlife trade is a primary strategy for lowering the risk of future pandemics.
Frequently Asked Questions
Why are mammals the primary focus of this research?
Mammals are frequently traded for food, fur, research, and traditional medicines. Because of their abundance in the trade and their biological history of transmitting pathogens to humans, they represent the highest risk for zoonotic spillover (Nature).
What is “disease spillover”?
Disease spillover occurs when a pathogen (like a virus or bacteria) jumps from an animal species to a human. The global wildlife trade creates frequent opportunities for this cross-species transmission by bringing diverse species into close contact with humans in high-stress environments.
How was the study conducted?
The team combined 40 years of records from three major wildlife-trade datasets with a 2021 database of species known to be associated with pathogens (Nature).
Looking Ahead
The evidence is clear: the global wildlife trade is a significant driver of pathogen transmission. As we look to prevent the next global health crisis, the focus must shift toward stricter regulations and a reduction in the trade of wild mammals. By limiting the circulation of these species in global markets, we can effectively lower the probability of the next pandemic emerging.